When you're in the bathroom and trying to take a quiet crap if someone is outside the door. Or when ther is multiple people in the room at once
by Lizzie Smith II November 4, 2010
Fred was scared by the driver seat ninja, the random and abrupt Karate chop causes Fred to poop a little.
by Lightyear25 August 14, 2011
Damn, do you see all of those car-seat ninjas outside of the dojo yesterday evening?, Cosmo Kramer pwnd a bunch of car-seat ninjas.
by Byrd-Man April 12, 2009